package com.todofun.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public class AuthFilter implements Filter{
	public static final String SESSON_USER = "SESSION_USER";
	public static final String LOGIN_ERROR = "LOGINERROR";
	public void destroy() {
	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpSession session = request.getSession();
		Object sessionUser = session.getAttribute(SESSON_USER);
		if(sessionUser != null) {
			chain.doFilter(req, res);
		}else{
			request.getRequestDispatcher("/login.jsp").forward(req, res);
		}
	}

	public void init(FilterConfig filterConfig) throws ServletException {
	}
	
}
